BRD: Correct @NonNull annotation

Bug: 140600285
Test: Ifd9e9abe3f2c89f724a0b918d99ec4e9db65ad56

After adding some tests, I confirmed that newInstance(InputStream) (and
the deprecated version that includes boolean isShareable) can return
null if the InputStream is null. Update the annotations for both - the
old one that has always been wrong, and the new one added in
I0bf8c4c72cc118d2799a59e8eb6c2cede546fceb.

Change-Id: Ib820edd1ad62665092c272a7b89b0a29b0e1bb32